Pen



FIG. 1 is a perspective view of a pen showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof; the right side elevational view is a mirror image of the left side;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is an exploded front view thereof;

FIG. 8 is an enlarged cross-sectional view taken in the direction 8—8 in FIG. 7;

FIG. 9 is an enlarged cross-sectional view taken in the direction 9—9 in FIG. 7; and,

FIG. 10 is an exploded perspective view thereof. 

The ornamental design for a pen, as shown and described. 